Has anyone come across one of these caterpillars before? I thought with the bright colouration and banding that it would be obvious, but I can't seem to ID it. It was on Blackthorn and was just positioned on the branch as in the photo, which made me think it was a Geometridae but obviously this is a big group. I've checked through the pugs on the UKleps website but still no joy.
Edit 21st June: I've found a similar caterpillar (V-pug) on this site but it doesn't match the description in Porter - any thoughts?